As said, the number will be the biggest issue. As to what breeds, I have tried all sorts of variations and my favorite is the have an array of colors both in chickens and eggs. It's just more visually appealing to me that way. At one point I had all buff orpintons. They're great birds, but all look the same. I'm not sure of the exact size of your coop, but I think they're fairly small. I'd say maybe 4 birds and I'd probably go with a buff orpington, olive egger, white leghorn and a black copper marans. That would give you a beautiful egg box and a variety of hens. You'd have light brown, dark brown, green and white eggs.
This is one of mine for example (not all the same as the birds I recommended, but giving you an idea of color variance)